import tkinter
import time
import random
class Ball():
    def __init__(self,canvas,color):
        self.canvas=canvas
        self.id=canvas.create_oval(0,0,30,30,fill=color)
        canvas.move(self.id,245,100)
        level=[-7,-5,-3,-1,1,3,5,7]
        self.x=random.choice(level)
        self.y=random.choice(level)
    def draw(self):
        self.canvas.move(self.id,self.x,self.y)
        pos=self.canvas.coords(self.id)
        if pos[3]>=400:
            self.y=-3
        if pos[1]<=0:
            self.y=3
        if pos[0]<=0:
            self.x=3
        if pos[2]>=500:
            self.x=-3
class  Paddle():
    def __init__(self, canvas, color):
        self.canvas = canvas
        self.id = canvas.create_rectangle(0, 0, 300, 20, fill=color)
        canvas.move(self.id, 100, 300)
        self.x=3
        self.y=0
        self.canvas.bind_all('<KeyPress-Left>',self.turn_left)
        self.canvas.bind_all('<KeyPress-Right>', self.turn_right)
    def draw(self):
        self.canvas.move(self.id,self.x,self.y)
        pos=self.canvas.coords(self.id)
        if pos[3]>=400:
            self.y=-3
        if pos[1]<=0:
            self.y=3
        if pos[0]<=0:
            self.x=3
        if pos[2]>=500:
            self.x=-3
    def turn_left(self,evt):
        self.x=-3
    def turn_right(self, evt):
        self.x=3
class Score():
    def __init__(self,canvas,color):
        self.canvas=canvas
        self.score=0
        self.id=canvas.create_text(450,20,text=self.score,fill=color)
tk=tkinter.Tk()
tk.title("第一个自己做的小游戏")
tk.resizable(0,0)
tk.wm_attributes('-topmost',1)
canvas=tkinter.Canvas(tk,width=500,height=400)
canvas.pack()
tk.update()
ball=Ball(canvas,"red")
paddle=Paddle(canvas,"blue")
score=Score(canvas,"red")
while 1:
    ball.draw()
    paddle.draw()
    tk.update_idletasks()
    tk.update()
    time.sleep(0.01)